EP2543189A1 - Ajustement du débit binaire dans un système de flux de données adaptatif - Google Patents

Ajustement du débit binaire dans un système de flux de données adaptatif

Info

Publication number
EP2543189A1
EP2543189A1 EP11708597A EP11708597A EP2543189A1 EP 2543189 A1 EP2543189 A1 EP 2543189A1 EP 11708597 A EP11708597 A EP 11708597A EP 11708597 A EP11708597 A EP 11708597A EP 2543189 A1 EP2543189 A1 EP 2543189A1
Authority
EP
European Patent Office
Prior art keywords
bit stream
content
bit rate
bit
response
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11708597A
Other languages
German (de)
English (en)
Inventor
Zhenyu Wu
Li Hua Zhu, (Eric)
Gad Moshe Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP2543189A1 publication Critical patent/EP2543189A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6377—Control signals issued by the client directed to the server or network components directed to server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/613—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for the control of the source by the destination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/752—Media network packet handling adapting media to network capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/756—Media network packet handling adapting media to device capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/762—Media network packet handling at the source 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365—Multiplexing of several video streams
    • H04N21/23655—Statistical multiplexing, e.g. by controlling the encoder to alter its bitrate to optimize the bandwidth utilization
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2385—Channel allocation; Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637—Control signals issued by the client directed to the server or network components
    • H04N21/6373—Control signals issued by the client directed to the server or network components for rate control, e.g. request to the server to modify its transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/65—Transmission of management data between client and server
    • H04N21/658—Transmission by the client directed to the server

Definitions

  • the invention relates to a method and apparatus for adaptively streaming multiple video bit streams through a network node.
  • the apparatus may be in the form of a set top box for use with multiple television displays or other viewing devices.
  • the invention concerns methods and apparatuses for adaptively streaming multiple video bit streams through a network node is disclosed.
  • a system is taught where at least one of the video bit streams is scaled in response to a bandwidth limitation or availability, where the selection of the bit stream selected for scaling in made in response to at least one of a user defined, service provider defined, and usage analysis defined priority list.
  • the present invention generally relates to an apparatus and methods for streaming multiple video streams through a network node, where the network or network node has a limited bandwidth.
  • the system is operative to adjust the bit rates of multiple video bit streams when the system has insufficient or extra bandwidth capacity.
  • the methods and associated apparatus are suitable for use in a home, educational, or business environment where multiple video streams are networked and processed, and intelligent selection of playback quality for some video streams over other video streams is desired.
  • multiple video bit streams can share the bandwidth at a network node. It is possible that their aggregated bit rate either exceeds or is below the bandwidth capacity of the node. In the former case, network congestion can occur, which leads to packet drops or long packet delays. Playback quality can be severely impacted by those factors. In the latter case, the bandwidth resource is under utilization at the node and thus the viewing experience is not at its optimum.
  • Adaptive Bit rate Streaming (or Adaptive Streaming) is a technique used in streaming multimedia over computer networks. While in the past most video streaming technologies utilized streaming protocols such RTSP, today's adaptive streaming technologies are almost exclusively based on HTTP and designed to work efficiently over large distributed HTTP networks such as the Internet. It works by detecting a user's bandwidth and CPU capacity in real time and adjusting the quality of a video stream accordingly. It requires the use of an encoder which can encode a single source video at multiple bit rates. The player client switches between streaming the different encodings depending on available resources. Resulting in reduced buffering, fast start time and a good experience for both high-end and low-end connections.
  • An adaptive streaming system can address the above problem by informing the content servers to adjust the sending bit rates.
  • the node can reduce the bit rate of one or several video programs in case of bandwidth insufficiency, or increase the bit rate in the case of bandwidth surplus.
  • Adaptive bit rate streaming systems work by determining a network node's bandwidth and adjusting the quality of the video stream in response to that determination.
  • the system requires an encoder which can encode a single source video at multiple bit rates.
  • the node requests or selects one of the different encodings depending on its available resources. This results in the desirable qualities of little or no buffering, fast start times, and optimal experience for both speed end and low speed connections.
  • the network node can inform the server and let it make the decision on which content to scale.
  • the server may also reallocate the available bit rate among multiple video bit streams accordingly.
  • the network node can take another commonly used approach. With this approach, the node equally divides the available bandwidth among multiple video sources. As an example, the node can allocate 2 Mbps for each of the two video sources for a total available bandwidth of 4 Mbps. Then the node informs the corresponding servers about the updated rate allocation, and each server in turn adjusts its sending video bit rate.
  • One problem with the above approach is that it does not take the video content into account.
  • the system may arbitrarily choose a video bit stream to adjust in order to optimize its bandwidth usage, but this practice can lead to suboptimal performance or cause unfavorable user viewing experience. It would be desirable for a network node to intelligently choose a video bit stream to adjust bit rate based on predetermined criteria.
  • the invention described herein addresses this and/or other problems.
  • the present invention concerns an apparatus associated methods for receiving multiple streams of video content and providing it to network devices, as well as adaptively adjusting the bit rate of the video streams in response to a predetermined criteria.
  • a method comprising the steps of receiving a first bit stream having a first bit rate, receiving a second bit stream having a second bit rate, determining a total bit rate of said first bit stream and said second bit stream, determining a first content of said first bit stream and a second content of said second bit stream in response to said total bit stream
  • Additional aspects of the present invention concern when the priority may be determined by at least one of a user, a service provider, and in response to a usage analysis.
  • an apparatus comprising a source of a first bit stream, said first bit stream having a first bit rate, a source of a second bit stream, said second bit stream having a second bit rate, a processor for determining a first content of said first bit stream and a second content of said second bit stream in response to said total bit stream exceeding a threshold and requesting an adjustment of said first bit rate of said first bit stream in response to determining that said first content has a lower priority than said second content.
  • the invention may comprise a method in response to when an adjustment of said first bit rate is requested in response to a network node having available bandwidth in order to increase the video quality of said first bit stream and said lower priority indicates a requirement for higher quality video.
  • Another aspect of the invention may include a method comprising the steps of receiving a first bit stream having a first bit rate, receiving a second bit stream having a second bit rate, determining a total bit rate of said first bit stream and said second bit stream, determining a first content of said first bit stream and a second content of said second bit stream in response to said total bit stream being less than a threshold, and requesting an adjustment of said first bit rate of said first bit stream in response to determining that said first content has a higher priority than said second content.
  • Another aspect of the invention may comprise an apparatus comprising a source of a first bit stream, said first bit stream having a first bit rate, a source of a second bit stream, said second bit stream having a second bit rate, a processor for determining a first content of said first bit stream and a second content of said second bit stream in response to said total bit stream being less than a threshold and requesting an adjustment of said first bit rate of said first bit stream in response to determining that said first content has a higher priority than said second content.
  • FIG. 1 is a diagram of an embodiment of a system embodying aspects of the present invention
  • FIG. 2 is a flow chart of an exemplary method according to the present invention.
  • FIG. 3 is a flow chart of an exemplary method according to the present invention.
  • the exemplifications set out herein illustrate preferred embodiments of the invention, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
  • the present invention provides an apparatus and associated methods for receiving compressed video content and adjusting the compression ratio of the content in response to available bandwidth of the network or a portion of the network, such as a network node or network gateway device. Furthermore the invention describes a high-level modification to facilitate the implementation of this functionality within an adaptive streaming application, recognizing the lack of support for this feature from many existing media transport formats,
  • multiple video bit streams can share the bandwidth at some network node, e.g. a home gateway where multiple viewers in a house can watch different streaming video programs at the same time.
  • some network node e.g. a home gateway where multiple viewers in a house can watch different streaming video programs at the same time.
  • network congestion can occur.
  • the aggregated bit rate is below the node's bandwidth capacity, the available resource is under-utilized.
  • both problems can be solved by dynamically changing the bit rates of some video sources. The question remains as how to choose the appropriate video source to adjust bit rate.
  • Such a device may include advanced features, such as advanced user interfaces, the ability to receive and decoder content encoding in one of a plurality of coding formats, the ability to transmit requests onto a network in response to a bandwidth determination, as well as to receive web pages, audio content and other digital programming. While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. For example, while the primary embodiment described receives and processes video content, this invention may be applied to audio, data, or multimedia content with equally desirable results.
  • FIG. 1 A diagram of an embodiment of a system embodying aspects of the present invention (100) is shown in Figure 1.
  • the system may receive a number of video streams (pA, pB, pC) from a number of servers (110, 120, 130). These video streams (pA, pB, pC) are transmitted over a network (140) to a home gateway (160).
  • the home gateway (160) can operate as a gateway to a home network (150) and is operative to process and couple these program streams to a variety of devices, including televisions (1 0), personal computers (180), set top boxes (190), and other network enabled devices.
  • a home gateway (160) or similar device has a limited bandwidth, for example 4 mbit per second.
  • the home gateway is capable of receiving and routing 2, 2 mbit per second video bit streams (pA, pB).
  • the home gateway (160) has no available bandwidth to process the 3 rd requested bit stream (pC).
  • the home gateway (160) must request, for example, that server sB (120) begin providing a 1 mbit bit stream, so that the home gateway can receive a 1 mbit bit stream sC from server sC (130).
  • a service provider or user may wish to prioritize which bit streams will start being received at a lower bit rate. For example, a user may wish to receive movies or sporting events at a higher bit rate, and therefore higher video quality, than news programming or children's programming.
  • a service provider may recognize that certain video content compresses better with less quality reduction than other types of content. For example, animated programs may compress better than sporting events.
  • the home gateway (160) can be a network router, a fiber optic multiplexer or the like.
  • the home gateway is operative to receive a first video stream (pA) from the network (140) and a second video stream (pB) from the network. These video streams may be sent by the same server or different server. Video streams may originate from the same server provider or different service providers.
  • the home gateway determines the total bandwidth utilized by the first video stream and the second video stream. If the total bandwidth utilized is greater than the maximum bandwidth allowed, at least one of the bit rates of at least one of the signals must be reduced.
  • the maximum bandwidth allowed can be a hard limit, such as the maximum bandwidth that can be facilitated by the home gateway (160), or it could be a soft limit, such as the maximum bandwidth allowed for video bit streams, leaving some available bandwidth for data, administrative, or auxiliary information. If the home gateway (160) determines that the maximum bandwidth has been exceeded, or would be exceeding if a bit stream was accepted, the home gateway (160) determines the content of the first bit stream and the content of the second bit stream. For example, the content of the first bit stream may be sports programming, and the content of the second bit stream may be animated programming. The home gateway compares each of these program types against a user defined priority list. The user creates a list where the types of programs are rated on a desirability scale.
  • the home gateway (160) uses this information to determine that the second bit stream, carrying the animated programming, should be reduced in bit rate.
  • the home gateway (160) sends a request to the server transmitting the second bit stream to reduce the bit rate of the second bit stream or to provide another version of the second bit stream with a lower bit rate.
  • the server may be transmitting the program in a number of bit streams with different bit rates, and the home gateway (160) may just need to switch to a different bit stream carrying that program.
  • the home gateway (160) may transmit the desired bitrate to the server, or the server may just step down the bit rate in predetermined increments.
  • a service provide may desire to scale certain types of programming over others. For example, a service provider may know from past experience that viewers describe an undesirable viewing experience when prime time network television or sporting events are scaled, as opposed to music programs or children's programming. In addition, the service provider may recognize that animated programming is easily compressed with little or no undesirable artifacts, where fast paced sport programming, such as ice hockey, does not compress easily and is subject to easily recognized artifacts. The service provider may provide a list of programming rankings to the home gateway (160), where the provided list is used to compare and request bit rate reductions or increases, according to criteria determined by the service provider.
  • the list may be automatically generated by the home gateway (160).
  • the home gateway may examine the type of content being viewed over the home network and generate usage statistics. If a user watches considerably more movies that children's programming, the home gateway may assume that the user desires higher quality movie bit streams that that of children's programming. Thus, when a reduction of bit rate is required, children's programming has a lower priority than movies.
  • This list may be altered or influenced by the user. For example, if a user is watching a certain program that has a lower priority, and the user desires a higher quality video, a user input can be received and the current programming will be moved higher on the priority list, either temporarily or permanently. Different video content exhibit different characteristics in terms of compression
  • each content server is capable of adaptive streaming in that it can switch between different copies of encoded video bit streams of the same video content and stream out a version with the average bit rate that matches best to the requested network bit rate.
  • the gateway can selectively scale back or boost the bit rate of one or multiple video sources. It can do so by following two criteria:
  • the viewers instruct the gateway about their video content type preferences.
  • a possible preference list can be: sports > movie > news > cartoon > sit-com
  • the gateway can automatically build a preference list, possibly over time, by analyzing the viewers' viewing habits. For example, more watched content types are given higher preference.
  • the gateway node can select video sources for rate adjustment more intelligently.
  • the node can first choose the video source with the least preferred content type to scale back its bit rate, followed by the next least one, and so on, until the bandwidth constraint is met.
  • the node can first choose the video source that has the most preferred content type to increase its bit rate, followed by the next preferred one, and so on, until the available bandwidth is fully occupied.
  • the user may also define a minimum bit rate for programming. In this instance, the lowest priority program is reduced to the minimum bit rate and the second lowest priority program's bit rate is reduced to meet the bandwidth requirements.
  • Statistical multiplexing is a commonly used technique at the encoding stage to exploit this diversity, when multiple video sequences are encoded to have a combined constant bit rate.
  • Statmux conceptually bit rate is allocated unevenly across video sequences according to their "easiness” measure, such that each time available bit rate is only given to the sequence that can most improve its visual quality.
  • the coding gain thus obtained is often called “Statmux gain”.
  • the Statmux principle can be similarly adopted by the gateway node to improve the overall (average) playback quality across all the video bit streams.
  • the gateway node can perform intelligent source selection. a. When the available bandwidth is not sufficient, the node can choose the bit stream with the "easiest” level to scale back its bit rate, so that its quality is least affected by the amount of rate cut among all the sources. Each time the node follows this rule until the adjusted total bit rate is within its bandwidth capacity.
  • the node can choose the the bit stream with the "hardest" level to increase its bit rate, so that its quality improves the most among all the sources. Each time the node follows this rule until the available bandwidth is fully occupied.
  • the network node there are a number of ways for the network node to obtain the "easiness" information of a video bit stream: (1 ) At client side, where a video bit stream is fully parsed and decoded, such information is most conveniently available. So it is possible for the gateway node to collect the information from clients. (2) The gateway partially parses and analyses a video bit stream to get an estimate. (3) Content serve provides the information. It is worth noting that Statmux gains become bigger with a more diverse video content set. In the future, it is expected that more video content types will be deployed and thus coexist, for example, MPEG-2, H.264, SVC, MVC, UltraHD, etc. That will make the video content diversity larger, and in turn increases the Statmux gain in the use case. To support existing standards, a field could be added in a transport packet header that contains a value that indicates the rate vs. visual distortion ratio for the video bit stream at its current bit rate, where the video bit stream is carried by transport stream that the packet belongs to.
  • a device may be receiving a video bit stream with errors indicating insufficient network bandwidth. These indications may include lost packets, delays, excessive buffering, or the like.
  • the device may then pole the other network devices to determined if the other network devices are receiving video bit streams and at what bit rate and what content.
  • the device may then compare this information to a priority list to determine which bit stream should be reduced.
  • the device may then request that the server transmitting the lowest priority bit stream lower the bit rate of that bit stream. Alternately, the device may request that the other network device receiving the lower priority bit stream request the reduction from the server.
  • the subroutine commences after detecting at least one bit stream session (205). After the subroutine commences (205), and then calculates the current total bit rate of all incoming video bit streams (210), if the sum exceeds an available bandwidth (215), a bit rate reduction amount is determined (230). If the available bandwidth is not exceeded, the system determines if all streaming sessions have ended (220). If so, the subroutine ends (225), waiting for another bit stream session. If there remains at least one bit stream session, the subroutine returns to step (210). Once the bit rate reduction amount is determined, in one example, the system queries a preference list to determine the least preferred bit stream (235).
  • the system checks the packet header to find the video with the smallest rate vs. visual distortion ratio 240 to determine the bit stream to be reduced (240). The subroutine then determines if all the video sessions have ended (245). If so, the subroutine ends (225), waiting for another bit stream session. If there remains at least one bit stream session, the subroutine sends a request to the video content server to reduce the bit rate of the selected bit stream by the calculated bit rate reduction amount (250). The subroutine then returns to step (210).
  • Figure 3 shows the operations it follows when the network or network gateway has bandwidth surplus.
  • an exemplary embodiment of the operation of the network node when it has a bandwidth surplus is shown (300).
  • the subroutine commences after detecting at least one bit stream session (305). After the subroutine commences (305), and then calculates the current total bit rate of all incoming video bit streams (310), if the sum is less than an available bandwidth threshold (315), a bit rate increase amount is determined (330). If the available bandwidth is not exceeded, the system determines if all streaming sessions have ended (320). If so, the subroutine ends (325), waiting for another bit stream session. If there remains at least one bit stream session, the subroutine returns to step (310).
  • the system queries a preference list to determine the most preferred bit stream (335).
  • the system checks the packet header to find the video with the greatest rate vs. visual distortion ratio (340) to determine the bit stream to be increased (340).
  • the subroutine determines if all the video sessions have ended (345). If so, the subroutine ends (325), waiting for another bit stream session. If there remains at least one bit stream session, the subroutine sends a request to the video content server to reduce the bit rate of the selected bit stream by the calculated bit rate reduction amount (350). The subroutine then returns to step (310).

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé et un appareil permettant une diffusion adaptative en continu de multiples flux de données binaires vidéo à travers un nœud de réseau. En particulier, un système est soumis à un apprentissage au cours duquel au moins un des flux de données binaires vidéo est mis à l'échelle en réponse à une limitation ou une disponibilité de largeur de bande, la sélection du flux de données binaires sélectionné pour la mise à l'échelle est faite en réponse à un utilisateur défini et/ou un fournisseur de services défini et/ou une liste définie de priorités d'analyse d'utilisation.
EP11708597A 2010-03-05 2011-03-02 Ajustement du débit binaire dans un système de flux de données adaptatif Withdrawn EP2543189A1 (fr)

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KR (1) KR101478656B1 (fr)
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CN102783170A (zh) 2012-11-14
KR101478656B1 (ko) 2015-01-02
US20130007831A1 (en) 2013-01-03
KR20130014508A (ko) 2013-02-07
JP2013521743A (ja) 2013-06-10
WO2011109101A1 (fr) 2011-09-09

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